Quatech QSC-100 - Manual (Page 29)

10 Specifications
Bus interface: PCI, 32-bit bus, 5-volt only
IBM-compatible computers
Dimensions: approx. 5.0" x 3.7"
Serial ports
Controller: 16750 with 64-byte FIFOs
Interface: One female D-37 connector
Four male D-25 connectors
using adapter cable
Transmit drivers: SN75150 or compatible
High-level output: +5V min, +8V typical
Low-level output: -5V max, -8V typical
Switching speed
low-to-high:
1.4 µs with 2500 pF load
40 ns with 15 pF load
high-to-low: 1.5 µs with 2500 pF load
20 ns with 15 pF load
Receive buffers: MC1489 or compatible
High-level input: +3V to +13V
Low-level input: -3V to -13V
Switching speed: 120 ns typical, 175 ns max
Power requirements
+5 volts: approx. 260 mA
+/-12 volts: approx. 35 mA
Temperature: operating 0° to 70°
storage -50° to 80°
Humidity: 10% to 90%
Quatech QSC-100 User's Manual 27